For sale is a used Air Arms s400 MPR. The price is $825 (was $875) for the rifle, an extra (shorter) air tube, hamster, scope riser (but not scope pictured), and air tube probe. Buyer pays for the shipping and gun will ship in hard case. (Hard case is in bad shape, but will provide good protection.)
Please email me at [email protected] with questions.
EDIT (9/26/23) - the gun's previous owner messaged me here to clarify a few details. (1) He purchased the gun new from "Bori at Topgun Airgun" so that makes me the 2nd owner. (2) He was told "that it was a prototype for the MPR-FT". (3) He "swapped to a regulated tube from I think Altaros". (4) The gun had developed a leak and was was showing erratic velocities, so the previous owner "sent it to Alan Z for work". <edits/>
I sent Air Arms the serial number and got back the following information on its original configuration:
MPR SPORTER .177 5.1 FTLB WALNUT RH RUBBER BUTT 07.09.2005
As you can see from the pics below, it does not have the rubber butt pad. Testing a couple of days ago confirms that it is currently shooting Air Arms 8.4g dome pellets at an average of 801 fps (11.9 fpe) and H&N FTT at 768 fps (11.3 fpe).
Installed on the gun is a longer air tube that has been regulated. This tube is set to accept a probe and does not use the quirky AA banjo fitting. Due to the long air tube, the bottom of the silver muzzle brake had to be scooped out to make the tube fit. Both the barrel and air tube have a few small specs where the bluing is gone (see pic below). Included in the sale is a shorter air tube. I have not tested it nor do I know much about it.
Back in April of 2022 I chony'd a full string of H&N FTT 4.52 from 2900 psi down to 1600 psi. (I'm short on pellets so I have not done a full string recently.) Here are details from that older one:
Pellet = H&N FTT 4.52mm
Fill start / end = 2900 psi / 1600 psi
Number of shots 90
ES = 16 fps
ES = 2.04%
FPS Avg = 777
FPE = 11.6
The FULL string on that was actually 105 shots with an ending velocity of 752 fps and finished at 1450 psi and I'm guessing the reg is set to about 110B.
The trigger is really, really light. It's worth noting that the 1st stage of the trigger barely returns to its resting position when you lift your finger from it. The bolt is smooth but I will occasionally feel that when you chamber a pellet, something catches it just a bit. It does not happen often. I wonder if the port had been opened up by a previous owner? I have not pulled the barrel out so I can't say (my borescope won't fit .177).
The wood is very pretty with a little tiger pattern but is used. Please see pics for some dings and scratches. The stock is right-handed. FWIW, I am left-eye-dominant and found this stock to be fairly usable shooting lefty. I guess that I'm not a perfectionist when it comes to fit. Speaking of fit, a nice hamster is included.
Some 10 shot groups at 35 yards while doing the chrony testing.
Please email me at [email protected] with questions.
EDIT (9/26/23) - the gun's previous owner messaged me here to clarify a few details. (1) He purchased the gun new from "Bori at Topgun Airgun" so that makes me the 2nd owner. (2) He was told "that it was a prototype for the MPR-FT". (3) He "swapped to a regulated tube from I think Altaros". (4) The gun had developed a leak and was was showing erratic velocities, so the previous owner "sent it to Alan Z for work". <edits/>
I sent Air Arms the serial number and got back the following information on its original configuration:
MPR SPORTER .177 5.1 FTLB WALNUT RH RUBBER BUTT 07.09.2005
As you can see from the pics below, it does not have the rubber butt pad. Testing a couple of days ago confirms that it is currently shooting Air Arms 8.4g dome pellets at an average of 801 fps (11.9 fpe) and H&N FTT at 768 fps (11.3 fpe).
Installed on the gun is a longer air tube that has been regulated. This tube is set to accept a probe and does not use the quirky AA banjo fitting. Due to the long air tube, the bottom of the silver muzzle brake had to be scooped out to make the tube fit. Both the barrel and air tube have a few small specs where the bluing is gone (see pic below). Included in the sale is a shorter air tube. I have not tested it nor do I know much about it.
Back in April of 2022 I chony'd a full string of H&N FTT 4.52 from 2900 psi down to 1600 psi. (I'm short on pellets so I have not done a full string recently.) Here are details from that older one:
Pellet = H&N FTT 4.52mm
Fill start / end = 2900 psi / 1600 psi
Number of shots 90
ES = 16 fps
ES = 2.04%
FPS Avg = 777
FPE = 11.6
The FULL string on that was actually 105 shots with an ending velocity of 752 fps and finished at 1450 psi and I'm guessing the reg is set to about 110B.
The trigger is really, really light. It's worth noting that the 1st stage of the trigger barely returns to its resting position when you lift your finger from it. The bolt is smooth but I will occasionally feel that when you chamber a pellet, something catches it just a bit. It does not happen often. I wonder if the port had been opened up by a previous owner? I have not pulled the barrel out so I can't say (my borescope won't fit .177).
The wood is very pretty with a little tiger pattern but is used. Please see pics for some dings and scratches. The stock is right-handed. FWIW, I am left-eye-dominant and found this stock to be fairly usable shooting lefty. I guess that I'm not a perfectionist when it comes to fit. Speaking of fit, a nice hamster is included.
Some 10 shot groups at 35 yards while doing the chrony testing.
Last edited: